VOL-1494 New tunnel_id openflow data may be passed down

Catch and ignore it to prevent exceptions

Change-Id: I68e0e2396c5ef5398ced2b56e62f0a4d9f06f3e1
diff --git a/python/adapters/brcm_openomci_onu/brcm_openomci_onu_handler.py b/python/adapters/brcm_openomci_onu/brcm_openomci_onu_handler.py
index 6fe5be0..6c73b30 100644
--- a/python/adapters/brcm_openomci_onu/brcm_openomci_onu_handler.py
+++ b/python/adapters/brcm_openomci_onu/brcm_openomci_onu_handler.py
@@ -484,6 +484,8 @@
             _push_tpid = None
             _field = None
             _set_vlan_vid = None
+            _tunnel_id = None
+
             self.log.debug('bulk-flow-update', device_id=device.id, flow=flow)
             try:
                 _in_port = fd.get_in_port(flow)
@@ -553,6 +555,11 @@
                         self.log.debug('field-type-metadata',
                                        metadata=_metadata)
 
+                    elif field.type == fd.TUNNEL_ID:
+                        _tunnel_id = field.tunnel_id
+                        self.log.debug('field-type-tunnel-id',
+                                       tunnel_id=_tunnel_id)
+
                     else:
                         raise NotImplementedError('field.type={}'.format(
                             field.type))